Samsung Electronics Co., Ltd.

Yong-ha Hwang

Soon-geun Jang

Soo-Yong Kim

A digital photographing apparatus includes a plurality of image pickup units that capture a plurality of images, a first image processing unit that generates a single input image from the plurality of images, a second image processing unit that generates a display image comprising common angle of view information in which the angle of view information of each of the plurality of image pickup units with respect to the single input image overlap, and a display unit that displays the display image. Each of the plurality of images shows a different parallax with respect to a subject, and each of the plurality of image pickup units have angle of view information.

Digital photographing apparatus having common angle of view display function, method of controlling the digital photographing apparatus, and medium for recording the method

A step motor control circuit that does not fix a reference voltage of a step motor control signal. The step motor control circuit may include a digital-to-analog (DAC) signal generator configured to generate first and second DAC signals in response to a step motor error signal, a gain adjust block configured to control gains of the first and second DAC signals in response to a control signal and output first and second step motor control signals, and a gain controller configured to output the control signal in response to a mode signal and a gain control signal, in which the first and second step motor control signals are pulse trains including a reference voltage, and the reference voltage may be a fixed voltage when the mode signal indicates a normal mode and the reference voltage may be a variable voltage when the mode signal indicates a power consumption reduction mode.

Step motor control circuit and method of generating step motor control signal

An apparatus and method for discriminating an optical disk includes a spindle motor for rotating the optical disk, an optical pickup device for picking up data recorded the disk, a servo signal processor for processing signals for tracking and focus servo of the optical pickup device by a prescribed control signal, and driving the spindle motor by an output signal of a digital signal processor. The digital signal processor shapes a track zero cross signal picked up from the optical pickup device to a logic waveform. A controller controls the operation of the digital signal processor, stores an optical disk discriminating reference value, generates a gate pulse when the disk is mounted, and compares a counted value of the track zero cross signal with the optical disk discriminating reference value to discriminate the type of disk being used. A counter is provided for counting the track zero cross waveform-shaped signal from the digital signal processor during a uniform velocity interval.

Apparatus and method for discriminating the type of optical disk mounted

A spindle motor controlling circuit for controlling the rotation of an optical disk system using a constant linear velocity servo. The circuit includes a spindle motor rotation sensing circuit for generating a phase frequency in response to the rotation of the spindle motor. A speed control part of the controlling circuit includes a speed error signal generating circuit that generates speed error data indicative of a difference between the period of the phase frequency and data representing a desired spindle motor speed. A phase control part of the control circuit includes a phase coefficient pulse generating circuit, a reference phase signal generating circuit and a phase error signal generating circuit. Finally, the controlling circuit includes a driving voltage generating circuit for generating a speed driving voltage corresponding to the speed error data and a phase driving voltage corresponding to the phase error signal. The driving voltages are used for driving the spindle motor.

Spindle motor controlling circuit of an optical disk system

A circuit for controlling the velocity of the spindle motor in an electronic device using a disk is disclosed. Particularly, an abnormal rotation preventing circuit is disclosed which monitors the angular velocity of the spindle motor and forcibly controlls it to rotate within a predetermined velocity range when it deviates from the predetermined range. The duty value of a phase difference between two signals among first, second and third phase control signals for driving a three-phase motor is measured. Then, the phase difference is counted and the velocity is sampled. An abnormal rotation control signal is generated when the sampled velocity deviates from the predetermined range. The motor's velocity is then forcibly controlled so as not to deviate from the predetermined range, thereby preventing abnormal rotation of the motor.

Circuit for preventing abnormal rotation of a spindle motor

A pickup driving apparatus, and particularly, a pickup-drive stabilizing apparatus for an optical disc player includes: a detector for detecting an inertia of a pickup relative to a movement speed of the pickup, when an instruction occurs to stop driving a sled motor that transversely shifts the pickup at a high speed for high-speed access; and a comparator that determines whether an inertia speed of the pickup has decelerated to within a range stable for tracking control by comparing the output signal of the detector with a preset reference signal and generates an output signal for starting the tracking control. Therefore, the pickup-drive stabilizing apparatus can stabilize the pickup of the optical disc player after performing high-speed information access on an optical disc.

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Seoul, South Korea

Yong-ha Hwang